JCC's in Harrisburg, Wilmington, Asheville, Indianapolis, Cherry Hill and elsewhere also have been targeted.

Kristen Bardolf thought about pulling her son from the Jewish Community Center's preschool program for a brief moment after she heard the center had received a bomb threat Monday morning.

But only for a moment, she said.

"I'm not going to let the hate win; we're just going to keep supporting the JCC," she said. "So, whoever did it, they won from the standpoint of inconveniencing people, but we're not going to be afraid."

Threats to JCCs have been occurring across the country since the beginning of the year, with numerous threats along the East Coast in particular investigated on Monday, according to USAToday.

Police converged on the local center, located at 2000 Hollywood Drive, York Township, just after 10 a.m. Monday when someone phoned in a threat of a bomb. They searched for about two hours with K-9 units from the York County Sheriff's Office and CSX Railroad Police.

The center was evacuated, with the preschool children taken to nearby York Suburban High School and the adult members moved to Temple Beth Israel. Officers found no bombs in their search, according to York Area Regional Police.

As police searched, JCC Spokeswoman Melissa Plotkin issued an update on the evacuation, saying, "Everyone is safe and accounted for."

Later in the day, Plotkin issued a news release, stating that "Law enforcement and our security consultants believe that these threats appear similar to the 'hoax' threats that JCCs have received over the last two months."

Bardolf said she received an email from the JCC to pick up her son at the nearby York Suburban High School, where the preschool students were taken.

"The JCC did a great job, along with Suburban's administration," she said.

Several Philadelphia-area JCCs and schools were evacuated following bomb threats as part of a national wave of threats.

“We denounce the latest round of bomb threats targeting Jewish institutions in the strongest possible terms,” said Nancy K. Baron-Baer, regional director of the Anti-Defamation League. “These threats are vile, and even more revolting in the aftermath of yesterday’s desecration of a Jewish cemetery in northeast Philadelphia."

About 12:20 p.m. Monday, police removed orange pylons from Hollywood Drive, and a police vehicle from the front of the center, allowing patrons to re-enter the property.

"We are working closely with Governor Wolf, our local Congressional representatives, the Justice Department, and the FBI to intensify the efforts to address these threats," the JCC news release stated. "It is imperative that immediate steps be taken to respond to the situation and identify and prosecute the perpetrators, so that we can stop future acts of intimidation."

During the police search, Pastor Laura Haupt of the Luther Memorial Church stood in front of her church's property, which sits between the JCC and York Suburban High School, to offer any help she could to JCC members.

"One of our parishioners called and said there was police activity at the JCC and so we came out to see if there's any way we could offer support or shelter," she said. "We found out they had an evacuation plan in place."

The community continued to rally around the JCC after the bomb threat.

The York County School of Technology posted a statement on its website saying it "stands in solidarity with our Jewish family members & friends today. We join with local elected officials, educators, and members of the public in denouncing violence or threats of violence against any member of our community."

Luther Memorial Church is planning a solidarity event for Thursday night, "in conjunction with our Interfaith coalition partners, in support of our dearly beloved Jewish neighbors whose sense of safety has been depleted by the hateful events of today. All are welcome, and all means ALL."

State Sen. Scott Wagner, R-York County, condemned the threats in a statement: “While we are all entitled to our opinions and freedom of speech, actions like those carried out today towards our Jewish Community Centers and other recent acts of vandalism in Jewish cemeteries in Pennsylvania are unconscionable and should be condemned.”

Gov. Tom Wolf issued this statement: “Any anti-Semitic act or act of intimidation aimed at Jewish institutions and people in Pennsylvania is truly reprehensible and we must find those responsible and hold them accountable. This is not who we are as Americans or Pennsylvanians. We will not take these threats and acts lightly and I have asked the Pennsylvania State Police and Office of Homeland Security to offer their full resources towards protecting these institutions and finding those responsible.”

The York NAACP issued this statement: "The York NAACP would like to express its concern with the events of today, causing the JCC to be evacuated. We would like to remind the JCC and the Jewish Community that we stand with them, against hate in any form. The Rev. Dr. Martin Luther King said, 'Darkness cannot drive out darkness; only light can do that. Hate cannot drive out hate; only love can do that.' We, the York NAACP, stand in light, love, and support of the whole community."